Cat flap (anag & Spoonerism) (4,3)

I think it could be either:

Which length description are you looking for?:

4,3

flat cap

(Other definitions for flat cap that I've seen before include "Headgear (of the working class?)" , "working-class symbol" , "Style of headgear" , "> lid" , "Type of hat" .)

I've seen this clue in The Guardian.

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